Knowledge Hub
Dr. R. Brahmananda Reddy
7 April 2026

Every cell in your body contains microscopic power plants called mitochondria. These organelles convert the food you eat and the oxygen you breathe into ATP — adenosine triphosphate — the molecular currency of cellular energy. Without ATP, nothing works: your heart cannot beat, your neurons cannot fire, your muscles cannot contract.
At the centre of this energy production process sits a molecule called NAD+ (nicotinamide adenine dinucleotide). NAD+ is a coenzyme present in every living cell, and it is absolutely essential for mitochondrial function. It shuttles electrons in the metabolic reactions that produce ATP, it activates sirtuins — a family of proteins critical for DNA repair and cellular stress response — and it fuels PARP enzymes that maintain genomic integrity.
Without adequate NAD+, your cellular machinery grinds to a halt. And here is the problem: your NAD+ levels are falling with every passing year.
Research published in Nature Reviews Molecular Cell Biology has established that NAD+ levels decline progressively with age across multiple tissues in both animal models and humans. The numbers are sobering:
This decline is not uniform across all tissues. Some organs — particularly the brain, heart, and skeletal muscle, which have the highest energy demands — are disproportionately affected. As a review in npj Metabolic Health and Disease (2025) noted, NAD+ and mitochondria are concentrated in energetically demanding tissues, and the depletion of NAD+ in these tissues directly limits ATP production efficiency.
The mechanisms behind age-related NAD+ loss are multifactorial:
The research connecting NAD+ decline to age-related disease is extensive. A comprehensive review in Cold Spring Harbor Perspectives in Medicine documented that NAD+ depletion is causally linked to:
The most widely studied oral approach involves supplementing with NAD+ precursors — molecules that the body converts into NAD+ through existing metabolic pathways:
A 2025 randomized, double-blind, placebo-controlled study published on medRxiv tested a novel NAD+ supporting supplement (Qualia NAD+) in healthy adults aged 35-76 for 28 consecutive days. The results showed an average NAD+ increase of 67% in whole blood, along with significant improvements in quality-of-life measures and reduced symptoms of ageing. This NAD+ increase was notably greater than what is typically reported with NR alone.
Intravenous NAD+ therapy delivers the molecule directly into the bloodstream, bypassing the digestive system and the need for enzymatic conversion. This approach has generated significant clinical interest, though the evidence base is still developing.
A pilot clinical study published on medRxiv (2024) evaluated acute IV NAD+ administration in healthy adults. The study found that after a 6-hour NAD+ infusion, plasma NAD+ levels rose, though with notable urinary excretion observed at six hours — indicating that timing, dosing, and frequency of IV administration are critical variables that require optimisation.
The clinical experience with IV NAD+ suggests that protocols involving repeated sessions (typically 3-10 infusions over 1-3 weeks) may be more effective than single treatments, as they allow for sustained elevation of cellular NAD+ stores. Patients commonly report improvements in energy, mental clarity, and sleep quality, though large-scale controlled trials are still needed to quantify these outcomes rigorously.
A comprehensive review published in Nature Aging (2025) titled "Emerging strategies, applications and challenges of targeting NAD+ in the clinic" highlighted several frontier approaches:
As a physician, I believe in being transparent about where the evidence stands. Here is a balanced assessment:
What is well-established:
What requires more evidence:
What is clear from clinical observation:
While therapeutic NAD+ restoration is valuable, lifestyle factors also influence NAD+ metabolism:
NAD+ therapy is not a magic bullet. It is one component of a comprehensive longevity strategy that includes biomarker monitoring, exercise prescription, nutritional optimisation, hormonal balance, and stress management. But the foundational science is compelling: without adequate NAD+, your cells cannot produce energy efficiently, repair their DNA, or activate the protective pathways that slow biological ageing.
The question worth asking is not whether NAD+ matters — the science on that is settled. The question is what your current levels are and whether targeted restoration could change your trajectory.
At Genoryx, we measure what your annual checkup misses — including NAD+ and the metabolic markers that reveal your cellular energy status. Our longevity physicians design evidence-based NAD+ restoration protocols tailored to your biochemistry. Book your assessment and find out where your cellular energy stands.
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UK-trained physician and founder of Genoryx. Writes about longevity medicine, healthspan optimization, and evidence-based wellness.
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NAD+ declines by up to 50% between your twenties and fifties, driving fatigue, cognitive decline, and accelerated aging. Three strategies claim to restore it: NMN supplements, NR supplements, and IV NAD+ infusions.

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